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Discussion Starter · #1 ·
Putting an AOD in an Early Bronco and I could use a C4 shifter (looks nicer than AOD shifter) but then can't put shifter in "1st". 4wheeling with an automatic transmission, how often is "1st" gear (rather than "D") used? Looking for some comments.
 

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you definatly want to have 1st gear holdback on the trails, buy an aftermarket 4spd auto shifter. B&M and Hurst make lots of them in many styles and prices.

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if it ain't broke, you don't go hard enough!
 

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On an AOD tranny the gear selector is set-up like this :p,R,N,OD,D,2 but when the tranny selector gear is placed in to second it will hold in first when moving slowly. The tranny is nothing more than a C4 with an overdrive gear put into it. When 4x4ing you will still be able to put the tranny in first to crawl.


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'91 Explorer, 5.5inch lift, 32' Superswampers
 

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Originally posted by Speedfreak:
On an AOD tranny the gear selector is set-up like this :p,R,N,OD,D,2 but when the tranny selector gear is placed in to second it will hold in first when moving slowly. The tranny is nothing more than a C4 with an overdrive gear put into it. When 4x4ing you will still be able to put the tranny in first to crawl.

Yep, AFAIK, the AOD uses the same old shifter as the 3spd autos.
Contact me if you want to come see my old setup, maybe you can use some of the parts.

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I'm on my way to impact, Taste the high speed dirt!
 

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the aod that is in my 73 f100 has 1st, drive and overdrive on the selecter. it's missing the 2nd gear slot, not the first.when i want to manually shift through the gears, in order to shift the trans into second I have to shift from first to drive and then back into first and that selects second gear inside the tranny, otherwise it skips second gear and shifts directly into third. alot of people dont know that.Im asuming that yours is missing the first gear slot, although ive never heard of that. the aod has a super low 1st gear and second is about the aquivelent of 1st in you old c-4. I dont think that you would ever notice the difference even if your trans started out in second gear. the only difference between the aod shifter and the c-4 shifter is the labeling of the gear selection. one should work with the other. the only thing is you have to remind yourself and others that the D is actually OD. you should never off road in OD and especially never tow in OD. you will cook it if you do.the aod is not a very strong transmission unless you bought it from B+M.
Hope this helps
 

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The typical ratios found in an AOD are first 2.48,second 1.39,third 1.00 and overdrive .79. there is a wide ratio gear set available which gives a 2.78 first but those are the only gear ratios ever available in the AOD from 1980 all the way to 1993. The tranny shifts normally 1st,2nd,3rd,OD when in OD selection if yours does not then you have a problem with yours 73 F100. I will be using an modified AOD/4R70W tranny in my Explorer to go behind my 5.0L engine I just picked up. This will give my the wider ratio than stock for better crawling. You are right about the poorly set up manual shift pattern of the trannys though.

A good up grade for this tranny is a good shift kit, these tranny shift funny in that when shifting they activate 2 gears at once to provide smooth shifting. (they were intended for granny cars not performance or truck)You cannt get ride of this shift style but you can speed it up by changing the pressures in the valve body.

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'91 Explorer, 5.5inch lift, 32' Superswampers

[This message has been edited by Speedfreak (edited January 04, 2002).]
 

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Discussion Starter · #8 ·
Thanks for the comments, although I'm a little confused. I have an AOD out of a 1989 Mustang and the gear selector has the full selection (PRNOD21). And my AOD in my 91 Ranger also has the full selection, didn't know there were some that had "gears" missing on the selector. I was thinking of using a C4 shifter but then I won't have access to "1", although I could shift into "2" and let the trany keep it in "1" until the rev's get up. Just wondered how often it is desirable to drive in "1" about the automatic shift point (if that makes sense).
 

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Originally posted by toque:
Thanks for the comments, although I'm a little confused. I have an AOD out of a 1989 Mustang and the gear selector has the full selection (PRNOD21). And my AOD in my 91 Ranger also has the full selection, didn't know there were some that had "gears" missing on the selector. I was thinking of using a C4 shifter but then I won't have access to "1", although I could shift into "2" and let the trany keep it in "1" until the rev's get up. Just wondered how often it is desirable to drive in "1" about the automatic shift point (if that makes sense).
First, the Ranger has a A4LD, not AOD. Same with non-5.0L Rustangs. The shifter on the AOD's that I've seen, were leftover C4 units I think, and they have PRN OD D 1. It will hold first gear when selected, and by shifting to D ti will shift to 2, then pull it back to 1 to hold it. if you drop below X speed it will automatically shift back to 1 on you.

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I just had my tranny built with a stage 2 shift kit, race sprags, clutches and steels . my only weak point is the plannetaries . it shifts through second so fast that I litterally cant tell it was ever in 2 unless i manually hold it there. I hope there isnt a prob in the trans but anything is possible. I dissagree with your idea of increasing pressures. the aod is very sensitive to kickdown adjustment and if its not setup within factory specs you can cook a brand new aod in a city block. im no tranny specialist but this is what ive found in researching mine.
Originally posted by Speedfreak:
The typical ratios found in an AOD are first 2.48,second 1.39,third 1.00 and overdrive .79. there is a wide ratio gear set available which gives a 2.78 first but those are the only gear ratios ever available in the AOD from 1980 all the way to 1993. The tranny shifts normally 1st,2nd,3rd,OD when in OD selection if yours does not then you have a problem with yours 73 F100. I will be using an modified AOD/4R70W tranny in my Explorer to go behind my 5.0L engine I just picked up. This will give my the wider ratio than stock for better crawling. You are right about the poorly set up manual shift pattern of the trannys though.

A good up grade for this tranny is a good shift kit, these tranny shift funny in that when shifting they activate 2 gears at once to provide smooth shifting. (they were intended for granny cars not performance or truck)You cannt get ride of this shift style but you can speed it up by changing the pressures in the valve body.

 

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Everybody has different ideas. I know with my experience drag racing Mustangs that a shift kit helped the tranny shift faster and never killed a tranny once. I know guys that have gone into the 11's with a mild AOD. I dont think a drag set-up is neccesary for the tranny but a good firming up is a good thing.

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'91 Explorer, 5.5inch lift, 32' Superswampers
Soon to be 5.0L power
 

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If you can only shift down into second the ford will hold that gear even after complete stop, eventually you will burn out your torque convertor and tranny from heat buildup if you wheel around in second all day long, unless you are using 4 low. Use the AOD shifter, looks aren't everything, maybe a B&M shifter would do the trick. Just my $0.02 worth!

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